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It's objectively content. And sure, that's your prerogative and getting any more than 500 moons is completely down to each player. You can even fast track it by spending coins to repeatedly get moons if you don't want to hunt them out.
I would say it's objectively "Filler". I think "objectively content" is going through the levels in the game in a chronological order for the first time and once it is consumed, it's consumed. I never counted back tracking for collectibles hidden in an ability wall within the same mapped areas as anything but filler.